Digital content protection systems and methods

ABSTRACT

In an embodiment of the invention, an integrated circuit comprises an input module configured to receive a first data segment, an identifier module having a hard coded identifier, a processing module coupled to the input module and coupled to the identifier module and configured to process the first data segment with the hard coded identifier to generate a first error correction code, and an output module configured to transfer the first error correction code for storage on a storage system.

RELATED APPLICATIONS

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FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

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MICROFICHE APPENDIX

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BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to digital content protection technologies, and in particular, to protecting digital content by linking stored content to particular host systems.

2. Description of the Prior Art

The importance of digital content protection has increased as the widespread distribution and use of digital content has become more common. Both content providers and end users desire to control how and when digital content is accessed and used. As electronic devices, such as personal computers, phones, music devices, and video devices, have proliferated, so has the need for improved digital content protection.

In the prior art, many software and hardware based techniques have been utilized to protect digital content. For example, digital content is often times processed using a software or hardware process executed on the host system portion of a device to encrypt or otherwise encode the content. The protected content is then transferred to the storage system portion of the device, or to a removable storage element, for storage. Upon retrieving the content from storage, the content is typically decrypted or decoded on the host system by the software or hardware process.

One problem with content protection solutions in the prior art is that, even if content can be strongly encrypted or encoded, many storage systems can be easily ported to new host systems. As a result, the encrypted content stored on the ported storage system can be accessed and the encryption eventually defeated. In one example, porting digital content to a new host system may be contrary to the wishes of a content provider. In another example, porting content to a new host system may be contrary to the wishes of an end user. Thus, a solution is needed to efficiently and cost effectively link stored digital content to particular host systems.

SUMMARY OF THE INVENTION

An embodiment of the invention solves the above problems and other problems by linking digital content stored on storage systems with the host systems that initially provided the content for storage. The digital content is linked to a host system by seeding an ECC process executed on the host system with a hard coded identifier. The resulting ECCs stored along with digital content links the content to the host system. If the same hard coded identifier is not used during the data retrieval process to correct data errors, the data being retrieved could be altered dramatically and rendered essentially useless. If the correct hard coded identifier is used during the retrieval process, the error correction process could proceed smoothly and the resulting data could be provided in a useful form.

In an embodiment of the invention, an integrated circuit comprises an input module configured to receive a first data segment, an identifier module having a hard coded identifier, a processing module coupled to the input module and coupled to the identifier module and configured to process the first data segment with the hard coded identifier to generate a first error correction code, and an output module configured to transfer the first error correction code for storage on a storage system.

In an embodiment of the invention, the input module is configured to receive a second data segment and a second error correction code and wherein the processing module is configured to process the second data segment with the second error correction code to generate a first result, process the first result with the hard coded identifier to generate a second result, and process the second data segment with the second result to correct the second data segment.

In an embodiment of the invention, the identifier module comprises a plurality of inputs connected to the processing module wherein the hard coded identifier is identified by setting the plurality of inputs during a manufacturing process.

In an embodiment of the invention, the plurality of inputs comprise a plurality of pins.

In an embodiment of the invention, the plurality of inputs comprise a plurality of fuses.

In an embodiment of the invention, the plurality of inputs comprise a plurality of electrical inputs.

In an embodiment of the invention, the plurality of inputs comprise a plurality of current inputs.

In an embodiment of the invention, the plurality of inputs comprise a plurality of voltage inputs.

BRIEF DESCRIPTION OF THE DRAWINGS

The same reference number represents the same element on all drawings.

FIG. 1 illustrates a content protection system in an embodiment of the invention.

FIG. 2 illustrates the operation of a content protection system in an embodiment of the invention.

FIG. 3 illustrates the operation of a content protection system in an embodiment of the invention.

FIG. 4 illustrates a device in an embodiment of the invention.

FIG. 5 illustrates a device in an embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1-5 and the following description depict specific embodiments of the invention to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these embodiments that fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple embodiments of the invention. As a result, the invention is not limited to the specific embodiments described below, but only by the claims and their equivalents.

FIG. 1 illustrates a functional block diagram of content protection system (CPS) 134 in an embodiment of the invention. In this embodiment, digital content is processed and stored in a manner so as to link the stored content to a particular host system. When content is retrieved from a storage system by a host system, the retrieval could succeed if the host system is the same host system that initially provided the content to the storage system for storage. If not, the retrieval process could fail.

In particular, data segments of digital content are processed by a content protection system using a hard coded identifier to seed an error correction code (ECC) process. Each hard coded identifier is preferably unique to each content protection system, and therefore to each host system and device. Each data segment is stored on a storage system, along with the associated ECC. When the digital content is retrieved from storage, each ECC is processed with the corresponding data segment to produce a result. The result is checked against the hard coded identifier. The differences between the result and the hard coded identifier are used to correct errors in the data segment.

In a successful case, such as when the retrieving host system is the same host system that initially provided the content, the data segment could be corrected appropriately and the corrected data segment provided to other host system elements for further data processing. In an unsuccessful case, such as when the retrieving host system is not the same host system that initially provided the content, the data segment could be erroneously corrected, resulting in invalid or unintelligible data.

Turning to FIG. 1, CPS 134 includes input module 135, processing module 136, output module 137, and identifier module 138. CPS 134 could be a semiconductor based integrated circuit and could also be referred to as a microchip or chip. It should be understood that CPS 134 could be a stand alone system. Alternatively, CPS 134 could be integrated as a subsystem of another integrated circuit. As illustrated by FIG. 1, processing module 136 is operatively coupled to input module 135. Processing module 136 is also operatively coupled to output module 137 and identifier module 138. It should be understood that other elements could be included with CPS 134.

Identifier module 138 could comprise one or more inputs connected to processing module 136. The inputs could be, for example, electrical inputs, such as voltage or current inputs, as well as pins or fuses. The inputs could be set during the manufacturing process to a predetermined identifier. The identifier could be, for instance, a binary identifier. As is well known in the art, semiconductor masks are used in the integrated circuit manufacturing process to create various circuit patterns on each layer of a microchip. In one example, a unique identifier could be defined on an integrated circuit mask or a set of masks. Each microchip produced by the manufacturing process could have a unique identifier that differs from device to device. The unique identifier is connected directly to processing module 136. In one embodiment, the identifier could be accessible only to processing module 136, and inaccessible to any other system elements, such as memory registers or bus systems.

FIG. 2 illustrates storage process 200 describing the operation of CPS 134 in an embodiment of the invention. In this embodiment, data is transferred to CPS 134 for ECC generation using the hard coded identifier of identifier module 138. It should be understood that ECC processes are well known in the art. The resulting ECC is stored on a storage medium, such as a disk drive or flash memory. Often times, the ECC is stored along with the subject data segment.

To begin, input module 135 receives a data segment from a host system element for storage on a storage system (Step 210). The data segment could be a portion of a larger data set, such as text, music, or video files. Processing module 136 reads the data segment and processes the data segment with the hard coded identifier from identifier module 138 to generate an error correction code (ECC) (Step 220). Processing module 136 passes the resulting ECC to output module 137 (Step 230). Output module 137 transfers the ECC for storage with the data segment.

FIG. 3 illustrates retrieval process 300 describing the operation of CPS 134 in an embodiment of the invention. In this embodiment, data is transferred from a storage system to CPS 134 for error correction purposes. Using the hard coded identifier of identifier module 138, CPS 134 is configured to correct any errors in the data segment being retrieved. Assuming CPS 134 is the same CPS that initially generated the ECC that is stored with the target data segment, the error correction process could proceed normally and the resulting data could be provided in a useful condition to other elements of the host system.

In a case wherein CPS 134 is not the same CPS that initially generated the ECC that is stored with the target data segment, the data segment could appear to have more errors than in the previous case. The error correction process could therefore mis-correct the data segment, thereby corrupting the subject data. The resulting data could either be provided in a damaged condition to other elements of the host system, or the data transfer process could cease entirely.

Turning to FIG. 3, input module 135 receives the data segment and associated ECC from storage (Step 310). Processing module 136 reads and processes the data segment with the ECC to generate a first result (Step 320). Next, processing module 136 processes the first result with the hard coded identifier from identifier module 138 to generate a second result (Step 330). The second result identifies errors in the data segment. Processing module 136 then corrects the data segment based on the second result (Step 340). As discussed above, if the hard coded identifier is the same identifier used to initially generate the ECC during the storage process, the error correction process could work correctly and the resulting data could be provided to host system elements in a useful form. If the hard coded identifier is not the same identifier used to initially generate the ECC during the storage process, the error correction process could further damage the data. The resulting data could be damaged and unintelligible.

It should be understood that CPS 134 could be implemented in an electronics device, such as a cell phone, audio player, video player, game machine, or personal computing device, as well as other types of electronics devices. In one example, FIG. 4 illustrates a functional block diagram of a device 400 having a content protection system 434 configured to operate as described for CPS 134. Device 400 includes host system 410 and storage system 440. Host system 410 includes storage control system 430, processing system 421, peripheral systems 423, memory system 422, and interface 424. Storage control system 430 includes buffer system 431, control unit 432, transfer system 433, and CPS 434. Storage system 440 includes storage medium 445.

In this embodiment, peripheral systems 423 are operatively coupled to processing system 421. Processing system 421 is operatively coupled to peripheral systems 423, memory system 422, and interface 424. Processing system 421 could be, for instance, a central processing unit. Memory system 422 is operatively coupled to processing system 421 and interface 424. Memory system 422 could be, for example, general purpose random access memory. Interface 424 could be a logical or physical interface, or both.

In operation, storage control system 430 controls the transfer of data to and from storage system 440. Control unit 432 is operatively coupled to buffer system 431, CPS 434, and transfer system 433. CPS 434 is operatively coupled to control unit 432 and buffer system 431. While not pictured, CPS 434 could be operatively coupled to interface 424. Similarly, control unit 432 could be operatively coupled to interface 424. Control unit 432 typically controls and coordinates the operations of the elements of storage control system 430. Other control units are possible. Buffer system 431 is operatively coupled to control unit 432, interface 424, and transfer system 433. Transfer system 433 is operatively coupled to control unit 432, buffer system 431, and storage medium 445.

Typically, operating system and application type programs are executed on host system 410 by processing system 421. In conjunction with the programs, data is transferred between host system 410 and storage system 440. The transfer protocols involved in data transfer are well known in the art. In a write scenario, data segments are transferred from memory system 422 over interface 424 to buffer system 431. CPS 434 reads a data segment from buffer system 431 and processes the data segment with a hard coded identifier to generate an ECC. CPS 434 then returns the ECC to buffer system 431. Buffer system 431 provides the ECC, along with the data segment, to transfer system 433. Transfer system 433 writes the ECC and data segment to memory on storage medium 445. The data segment stored on storage system 440 is thus bonded to host system 410 because the ECC associated with the data segment was generated using an inaccessible, hardwired identifier.

In a read scenario, transfer system 433 reads from storage medium 445 a data segment and the ECC associated with the data segment. Transfer system 433 passes the ECC and data segment to buffer system 431. CPS 434 processes the data segment with the ECC to generate a first result. CPS 434 then processes the first result with the hard coded identifier to generate a second result. The second result identifies possible errors in the data segment. CPS 434 then corrects the data segment using the second result. If host system 410 is the host system bonded to the data segment, the resulting corrected data segment could be valid and useful for the operating system or application programs running on host system 410. If not, the resulting corrected data segment could be rendered largely damaged and useless. FIG. 5 illustrates device 400, except that in FIG. 5, storage control system 430 resides on storage system 440.

It should be understood that other digital content protection systems or schemes could be implemented along with the content protection described above. For instance, digital content could be encrypted prior to the ECC generation process. It should also be understood that the ECC process could be seeded with other elements, such as a logical block address, in addition to seeding with a hard coded identifier. It should also be understood that the content protection systems described above could include an encryption module. The encryption module could use the hard coded identifier to encrypt data segments in addition to the ECC process.

Advantageously, embodiments of the invention protect digital content by processing and storing digital content in a manner so as to link the stored content to a particular host system. In particular, a hard coded identifier is used to seed an ECC process. The resulting ECCs that are stored with data segments are inherently linked to the hard coded identifier, which resides permanently on the host system. When content is retrieved from a storage system by a host system, the retrieval could succeed if the host system is the same host system that initially provided the content to the storage system for storage. If not, the retrieval process could fail. 

1. An integrated circuit comprising: an input module configured to receive a first data segment; an identifier module having a hard coded identifier; a processing module coupled to the input module and coupled to the identifier module and configured to process the first data segment with the hard coded identifier to generate a first error correction code; an output module configured to transfer the first error correction code for storage on a storage system; wherein the input module is further configured to receive a second data segment and a second error correction code; and wherein the processing module is further configured to process the second data segment with the second error correction code to generate a first result, process the first result with the hard coded identifier to generate a second result, and process the second data segment with the second result to correct the second data segment.
 2. The integrated circuit of claim 1 wherein the identifier module comprises a plurality of inputs connected to the processing module wherein the hard coded identifier is identified by setting the plurality of inputs during a manufacturing process.
 3. The integrated circuit of claim 2 wherein the plurality of inputs comprise a plurality of pins.
 4. The integrated circuit of claim 2 wherein the plurality of inputs comprise a plurality of fuses.
 5. The integrated circuit of claim 2 wherein the plurality of inputs comprise a plurality of electrical inputs.
 6. The integrated circuit of claim 5 wherein the plurality of inputs comprise a plurality of current inputs.
 7. The integrated circuit of claim 5 wherein the plurality of inputs comprise a plurality of voltage inputs.
 8. A method of operating an integrated circuit comprising an input module, an output module, and a processing module coupled to the input module and the output module, the method comprising: in the input module, receiving a first data segment; in the processing module, reading a hard coded identifier from an identifier module coupled to the processing module, processing the first data segment with the hard coded identifier to generate a first error correction code; in the output module, transferring the first error correction code for storage on a storage system; in the input module, receiving a second data segment and a second error correction code; and in the processing module, processing the second data segment with the second error correction code to generate a first result, processing the first result with the hard coded identifier to generate a second result, and processing the second data segment with the second result to correct the second data segment.
 9. The method of claim 8 wherein the identifier module comprises a plurality of inputs connected to the processing module wherein the hard coded identifier is identified by setting the plurality of inputs during a manufacturing process.
 10. The method of claim 9 wherein the plurality of inputs comprise a plurality of pins.
 11. The method of claim 9 wherein the plurality of inputs comprise a plurality of fuses.
 12. The integrated circuit of claim 9 wherein the plurality of inputs comprise a plurality of electrical inputs.
 13. The integrated circuit of claim 12 wherein the plurality of inputs comprise a plurality of current inputs.
 14. The integrated circuit of claim 12 wherein the plurality of inputs comprise a plurality of voltage inputs.
 15. A device comprising: a storage medium; and a host system having a plurality of system elements and a storage control system for controlling data transfer between the plurality of system elements and the storage medium, the storage control system comprising: a content protection system configured to receive a first data segment from a one of the plurality of system elements, read a hard coded identifier, process the first data segment with the hard coded identifier to generate a first error correction code, and transfer the first error correction code for storage on the storage medium; and a transfer system configured to transfer the first data segment with the first error correction code to the storage medium; and wherein the content protection system is further configured to receive a second data segment and a second error correction code, process the second data segment with the second error correction code to generate a first result, process the first result with the hard coded identifier to generate a second result, and process the second data segment with the second result to correct the second data segment. 